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- What: /sys/class/pwm/
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- The pwm/ class sub-directory belongs to the Generic PWM
- Framework and provides a sysfs interface for using PWM
- channels.
- What: /sys/class/pwm/pwmchip<N>/
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- A /sys/class/pwm/pwmchipN directory is created for each
- probed PWM controller/chip where N is the base of the
- PWM chip.
- What: /sys/class/pwm/pwmchip<N>/npwm
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- The number of PWM channels supported by the PWM chip.
- What: /sys/class/pwm/pwmchip<N>/export
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- Exports a PWM channel from the PWM chip for sysfs control.
- Value is between 0 and /sys/class/pwm/pwmchipN/npwm - 1.
- What: /sys/class/pwm/pwmchip<N>/unexport
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- Unexports a PWM channel.
- What: /sys/class/pwm/pwmchip<N>/pwmX
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- A /sys/class/pwm/pwmchipN/pwmX directory is created for
- each exported PWM channel where X is the exported PWM
- channel number.
- What: /sys/class/pwm/pwmchip<N>/pwmX/period
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- Sets the PWM signal period in nanoseconds.
- What: /sys/class/pwm/pwmchip<N>/pwmX/duty_cycle
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- Sets the PWM signal duty cycle in nanoseconds.
- What: /sys/class/pwm/pwmchip<N>/pwmX/polarity
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- Sets the output polarity of the PWM signal to "normal" or
- "inversed".
- What: /sys/class/pwm/pwmchip<N>/pwmX/enable
- Date: May 2013
- KernelVersion: 3.11
- Contact: H Hartley Sweeten <[email protected]>
- Description:
- Enable/disable the PWM signal.
- 0 is disabled
- 1 is enabled
- What: /sys/class/pwm/pwmchip<N>/pwmX/capture
- Date: June 2016
- KernelVersion: 4.8
- Contact: Lee Jones <[email protected]>
- Description:
- Capture information about a PWM signal. The output format is a
- pair unsigned integers (period and duty cycle), separated by a
- single space.
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